This is the one I ordered on Amazon, but they also have the small ones that sit on the substrate. You just don't want the wire mesh ones because their legs can get stuck.
Any of these wheels can be found in the hamster section at petco/petsmart or Amazon

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4 purple pinchers & 2 ecuadorians living a life of luxury in south west Louisiana.
Follow my hermit crab learning journey on instagram! @hermitcrabs_in_the_boot

I have two modified hamster wheels in each of my three crabitats. I highly recommend them! Hermit crabs walk miles in the wild. By offering them the modified hamster wheels, we are offering them the ability to walk miles in their crabitats. By adding the craft mesh it allows them to spread their legs out naturally as they walk, and the ability to grip while they are walking also.

Truly blessed to have incredible creatures, wonderful friends and my amazing family in my life!! I'm very thankful & grateful for all of them! www.thehealthyhermit.com